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# Groundwater Modeler

- **Company:** Larry Walker Associates Incorporated
- **Location:** Santa Monica, CA, United States
- **Experience:** Experienced
- **Salary:** $90,000.0 - $125,000.0
- **Contract:** Permanent contract
- **Skills:** Data Validation, Data Systems, Python (Programming Language), Data Processing, Scripting
- **Published:** June 12, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=24dad4d3bd588997

## About the Role

Do you have a valid Professional Geologist (PG) certification?, Do you have experience in Technical writing within technology?, Do you have a Bachelor's degree?, * Bachelor's degree or higher in Geology, Hydrologic Sciences, Civil/Environmental Engineering, or a closely related field

 * Demonstrated hands-on experience with MODFLOW-based numerical groundwater modeling (e.g., MODFLOW-6, MODFLOW-OWHM, MODFLOW-USG, MODFLOW-NWT) or equivalent
 * 4 years of professional experience in hydrogeology, or water resources engineering
 * Proficiency in Python or R for scripting, data processing, and model pre/post-processing
 * Strong technical writing skills with the ability to document model construction, calibration, and results clearly for both technical and regulatory audiences
 * Willingness to travel as needed, * Experience with IWFM, C2VSim, or other integrated surface water-groundwater modeling frameworks used by DWR
 * Familiarity with California water data systems (DWR, GAMA, CIMIS, OpenET, DDW, CEDEN) for model input development and data validation
 * Professional registration (e.g., PG, CHG, PE) in California is highly desired
 * Excellent work ethic, self-directed, and highly motivated
 * Valid driver's license

## Description

* Develop, calibrate, and apply numerical groundwater flow and transport models using MODFLOW (e.g., MODFLOW-6, MODFLOW-OWHM, MODFLOW-USG) and/or DWR integrated hydrologic models (IWFM, C2VSim)
 * Perform model parameter estimation and uncertainty analysis
 * Develop and evaluate model input datasets including hydrostratigraphy, recharge, pumping, and water quality using R or Python, specialized software, and GIS
 * Conduct scenario analyses to evaluate groundwater management strategies, pumping impacts, and recharge effectiveness
 * Use model outputs to support basin management, facilitate stakeholder engagement, and meet regulatory requirements
 * Prepare clear and well-documented technical reports, model documentation, and presentations


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